Posted by Jeannie on Sunday, May 22, 2011 at 4:27pm.
Eq1: X + 9Y = 33.
Eq2: 5x + 4y = 1.
Multiply both sides of Eq1 by -5 and add the Eqs:
Eq1: -5X - 45Y = -165.
Eq2: 5X + 4Y = 1.
Sum: 0 - 41Y = -164,
Y = 4.
In Eq1, substitute 4 for y:
X + 9*4 = 33,
X = 33 - 36 = -3.
Solution set: (X,Y) = (-3,4).
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